chore: more launch builder style function (#7897)

Author: mattsse

crates/node-builder/src/launch/common.rs

@@ -145,6 +145,16 @@ impl<T> LaunchContextWith<T> {
             attachment: Attached::new(self.attachment, attachment),
         }
     }
+
+    /// Consumes the type and calls a function with a reference to the context.
+    // Returns the context again
+    pub fn inspect<F>(self, f: F) -> Self
+    where
+        F: FnOnce(&Self),
+    {
+        f(&self);
+        self
+    }
 }
 
 impl<L, R> LaunchContextWith<Attached<L, R>> {
@@ -338,6 +348,12 @@ where
         )
     }
 
+    /// Convenience function to [Self::init_genesis]
+    pub fn with_genesis(self) -> Result<Self, InitDatabaseError> {
+        init_genesis(self.provider_factory().clone())?;
+        Ok(self)
+    }
+
     /// Write the genesis block and state if it has not already been written
     pub fn init_genesis(&self) -> Result<B256, InitDatabaseError> {
         init_genesis(self.provider_factory().clone())
@@ -352,6 +368,12 @@ where
         self.node_config().max_block(client, self.provider_factory().clone()).await
     }
 
+    /// Convenience function to [Self::start_prometheus_endpoint]
+    pub async fn with_prometheus(self) -> eyre::Result<Self> {
+        self.start_prometheus_endpoint().await?;
+        Ok(self)
+    }
+
     /// Starts the prometheus endpoint.
     pub async fn start_prometheus_endpoint(&self) -> eyre::Result<()> {
         let prometheus_handle = self.node_config().install_prometheus_recorder()?;

crates/node-builder/src/launch/mod.rs

@@ -95,6 +95,7 @@ where
             config,
         } = target;
 
+        // setup the launch context
         let ctx = ctx
             .with_configured_globals()
             // load the toml config
@@ -104,16 +105,18 @@ where
             // ensure certain settings take effect
             .with_adjusted_configs()
             // Create the provider factory
-            .with_provider_factory()?;
-
-        info!(target: "reth::cli", "Database opened");
-
-        ctx.start_prometheus_endpoint().await?;
-
-        debug!(target: "reth::cli", chain=%ctx.chain_id(), genesis=?ctx.genesis_hash(), "Initializing genesis");
-        ctx.init_genesis()?;
-
-        info!(target: "reth::cli", "\n{}", ctx.chain_spec().display_hardforks());
+            .with_provider_factory()?
+            .inspect(|_| {
+                info!(target: "reth::cli", "Database opened");
+            })
+            .with_prometheus().await?
+            .inspect(|this| {
+                debug!(target: "reth::cli", chain=%this.chain_id(), genesis=?this.genesis_hash(), "Initializing genesis");
+            })
+            .with_genesis()?
+            .inspect(|this| {
+                info!(target: "reth::cli", "\n{}", this.chain_spec().display_hardforks());
+            });
 
         // setup the consensus instance
         let consensus: Arc<dyn Consensus> = if ctx.is_dev() {